新型钢板组合梁桥车桥耦合振动控制研究

Research on Vehicle-bridge Coupling Vibration Control of New Steel Plate Composite Beam Bridge

新型钢板组合梁桥自重轻,车辆质量与主梁的模态质量之比较大,在车辆活载下易发生振动。文中以某一新型钢板组合梁桥为例进行动力特性分析,研究不同质量比的液体质量双调谐阻尼器(TLMD)对结构动力响应的影响,并进行简谐激励时程分析和车桥耦合振动数值模拟,对该桥进行车桥耦合振动实测和对比。结果表明,TLMD对钢板组合梁桥具有良好的减振效果;TLMD质量比越大,结构受控后阻尼比越大,振幅越小;作用在跨中TLMD质量越大,对结构静力和动力特性影响均较大;建议类似桥梁减振的TLMD质量比取1.0%。

The new type of steel plate composite beam bridge is light in dead weight,and the vehicle mass is relatively large with the modal mass of the main girder,which is prone to vehicle-induced vibration.It is necessary to take effective measures to control the vibration.Taking a new type steel plate composite girder bridge as an example,the dynamic characteristic analysis was carried out.The influence of liquid mass double tuned dampers(TLMD)with different mass ratios on the structural dynamic response was studied,and the harmonic excitation time history analysis and vehicle-bridge coupling were carried out.Numerical simulation of vibration,and actual measurement and comparison of vehicle-bridge coupled vibration of the bridge is also performed.The results show that TLMD has a good damping effect on steel plate composite girder bridges;the larger the mass ratio of TLMD,the larger the damping ratio and the smaller the amplitude after the structure is controlled.However,the greater the mass of the TLMD acting on the mid-span,the greater the impact on the structural static and dynamic characteristics;it is recommended that the mass ratio of TLMD similar to bridge vibration reduction is 1.0%.